Preparation and properties of metallocene-catalyzed PE/starch nanocomposites : role of nanocompatibilizer / S.-M. Lai in INTERNATIONAL POLYMER PROCESSING, Vol. XXII, N° 5 (11/2007)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXII, N° 5 (11/2007) . - p. 502-511 Titre : Preparation and properties of metallocene-catalyzed PE/starch nanocomposites : role of nanocompatibilizer Type de document : texte imprimé Auteurs : S.-M. Lai, Auteur ; K.-T. Ti, Auteur Année de publication : 2007 Article en page(s) : p. 502-511 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : The properties of metallocene catalyzed polyethylene (mPE)/starch blends and nanocomposites containing mPE-g-maleic anhydride (mPE-g-MA) compatibilizer, reinforced with 1 phr commercial organoclay (20A) at various amounts of pristine starch are discussed. The results from X-ray diffraction (XRD) and transmission electron microscope (TEM) experiments revealed that nanocomposites were achieved in all cases. No observable diffraction peaks in the low angle region were detected. Clay was preferentially located within the mPE and starch interface and the mPE matrix. The crystallization temperatures of nanocomposites increased with the addition of clay acting as a nucleating agent. However, the melting temperatures and the glass transition temperatures remained largely unchanged. Clay incorporation provided a heat barrier that profoundly increased the blend thermal stability. A maximum increase in tensile strength and Young's modulus was obtained, up to 60% and 105%, respectively, using nanoclay reinforced compatibilizer (termed nanocompatibilizer) in comparison with neat compatibilizer for pristine starch filled cases. Slightly lower water absorption capability was observed for nanocompatibilizer reinforced cases through the sheet-like structure of clay compared with neat compatibilizer cases. DOI : 10.3139/217.2051 En ligne : https://drive.google.com/file/d/1nDCsBKHa-0ydYI_a6ZkFz9FWx9xXybbK/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2692 [article]

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Twin screw compounding of PE-HD wood flour composites / Y. Wang in INTERNATIONAL POLYMER PROCESSING, Vol. XVI, N° 2 (06/2001)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVI, N° 2 (06/2001) . - p. 100-107 Titre : Twin screw compounding of PE-HD wood flour composites Type de document : texte imprimé Auteurs : Y. Wang, Auteur ; H. C. Chan, Auteur ; S.-M. Lai, Auteur ; H.-F. Shen, Auteur Année de publication : 2001 Article en page(s) : p. 100-107 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : The compounding of wood flour filled polyethylene is discussed with reference to co-rotating twin-screw extruders from two manufacturers. An acrylic acid-grafted polyethylene (PE-HD-AA) copolymer was used as the compatibilizer in high density polyethylene wood flour (PE-HD/WF) composite system. Special consideration was given to the compounding of the heat- and shear-sensitive wood flour. The relevant screw configuration was found to consist of short mixing length with low intensity of shearing. A suitable combination of processing variables was necessary for limiting the thermal degradation of the wood filler, however, tensile properties of the composites were not affected much. Furthermore, the allowable range of processing temperature was limited and there was an upper bound of rotating speed and a lower bound of throughput rate within which the darkening of wood filler in the composites was acceptable. The processing window was also experimentally constructed in terms of the degree of darkening of wood composites. DOI : 10.3139/217.1627 En ligne : https://drive.google.com/file/d/1aqYnnWGOJtIO6NKrYR1ODORgoE2LgidJ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15889 [article]

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